Metal deforming – By use of closed-die and coacting work-forcer – Cup or shell drawing
Patent
1982-09-30
1983-11-15
Gilden, Leon
Metal deforming
By use of closed-die and coacting work-forcer
Cup or shell drawing
72348, 72350, B21D 2200
Patent
active
044148364
ABSTRACT:
An improved method and apparatus for deep drawing metal containers is disclosed in which flat sheet metal blanks are initially drawn into shallow cups having an open top, a substantially flat bottom wall, a substantially cylindrical sidewall and a curved transition section joining the bottom wall and sidewall. A redraw sleeve adapted to fit into and support the cups has a first annular clamping surface on its free end contoured and arranged to engage the transition section and the adjacent annular peripheral portion of the bottom wall of a cup. An annular redraw die is supported for movement from a retracted position spaced from the redraw sleeve to a clamping position cooperating with the redraw sleeve to clamp and hold the cups during redrawing. The redraw die has a second clamping surface contoured to engage the outer surface of the transition section and the adjacent annular peripheral portion of the bottom wall of a cup supported on the redraw sleeve. One of the clamping surfaces is defined by an annular clamping surface portion on an outer and at least one inner concentric ring member, with the clamping surface portion on the outer ring member being adapted to engage and clamp the transition section. A male die engages the bottom wall of a cup clamped between the redraw sleeve and redraw die to redraw the clamped cup. The annular ring members each apply a clamping load to a cup, and preferably, the load applied by the outer ring member is transferred to the inner ring member as the cup is drawn inwardly past the outer ring member.
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Gilden Leon
National Steel Corporation
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